126 



GASTROPODA. 



Otina (Gray). Shell minute, ear-shaped. Animal 

 with the mantle simple, and short tentacles. 



0. otis. Fig. 196 ; f . 



Lamellaria (Montagu). Shell thin, pellucid; 

 aperture very wide ; no operculum. Animal with 

 a very large mantle, quite concealing the shell, 



notched in front. 







L. perspicua. Fig. 197 ; n.s. 

 tentaculata. 



198 



Natica (Lamk.). Shell thick, solid, polished; 

 umbilicus large ; operculum sub-spiral. Animal 

 without eyes ; a large veil, uniting the tentacles ; 

 foot very large, with a fold in front, turned back 

 over the head, and a great lobe behind, partly 

 covering the shell ; tongue short ; gill single. 



N. helicoides. N. nitida. 



Kingii. pusilla. 



monilifera. Fig. 198 ; f n. s. sordida. 



Montagui. 



